You can uninstall or removes an installed fancontrol-modules-4.7.0-1-pow package itself from Debian 9 (Stretch) through the terminal,
$ sudo apt-get remove fancontrol-modules-4.7.0-1-pow
If you would like to remove fancontrol-modules-4.7.0-1-pow and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove fancontrol-modules-4.7.0-1-pow
If you use with purge options to fancontrol-modules-4.7.0-1-pow package all the configuration and dependent packages will be removed.
$ sudo apt-get purge fancontrol-modules-4.7.0-1-pow
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove fancontrol-modules-4.7.0-1-pow